二维编织陶瓷基复合材料偏轴拉伸力学性能预测  

Mechanical properties prediction of 2D braided ceramic matrix composites under off-axial tension

作　　者：王奇志[1] 林慧星 许赟泉 WANG Qizhi;LIN Huixing;XU Yunquan(School of Aeronautic Science and Engineering, Beihang University, Beijing 100191, China)

机构地区：[1]北京航空航天大学航空科学与工程学院,北京100191

出　　处：《复合材料学报》2018年第12期3423-3432,共10页Acta Materiae Compositae Sinica

摘　　要：基于二维编织C/SiC复合材料的细观结构,建立了碳纤维丝/热解碳界面/SiC基体和纤维束/表层SiC基体两种尺度下的细观单胞模型,通过有限元方法计算碳纤维丝/热解碳界面/SiC基体模型的等效弹性常数和强度,然后代入纤维束/表层SiC基体模型中计算,并引入Tsai-Wu失效准则,考虑不同失效模式的损伤,建立了二维编织C/SiC复合材料的渐进损伤模型,模拟了其偏轴拉伸应力-应变行为。针对该模型,阐述了二维编织C/SiC复合材料单胞模型在复杂应力状态下其纤维束的损伤过程。数值模拟结果与实验数据吻合较好,验证了模型的有效性,为该种材料的力学性能分析提供了一种有效方法。Based on the meso-structure of 2D braided C/SiC composites,two micromechanical models were presented to simulate the progressive damage behavior of 2D braided C/SiC composites that subjected to off-axial tension.The equivalent elastic constants and strength of the carbon fiber/pyrolytic carbon interface/SiC matrix model were calculated by the finite element method and then applied to the yarn/SiC matrix model.The Tsai-Wu failure criteria that considers different damage modes was utilized to set up the progressive damage model,and the stress-strain relation of 2D braided C/SiC composites was simulated.The damage model explains the damage evolution of 2D braided C/SiC composites tows in the complex stress state.The numerical results accurately capture the experimental data,which demonstrates the validity of the proposed analytical model.And this model provides a method to predict the mechanical properties of 2D braided C/SiC composites.

关 键 词：二维编织陶瓷基复合材料 力学性能 多尺度分析 渐进损伤 有限元法 

分 类 号：TB332[一般工业技术—材料科学与工程]